What is the molar mass of (NH4) 2C03?

a) 144 g

b) 96 g

c) 138 g

d) 78 g

B

Explanation:

It has 2 NH4 molecules and 1 CO3 molecule.

NH4 has a molar mass of 18g/mol. Since there are two NH4s, it makes up 36g of the (NH4) 2CO3.

CO3 has a molar mass of 60g/mol. Since there is one CO3, it makes up 60g of the (NH4) 2CO3.

If you add up 36 and 60, you will get 96g.